Sharing traffic limit is monthly, not daily like I assumed at first. They recently added a log for shared traffic to see what you're sharing daily - go to Sharing, Sharing Traffic. Very nice feature, however, honestly, when I found out it's monthly it's not very practical to cap your sharing via that setting, so I put it back to unlimited. I have days where I've shared over 10GB/day, which seems a bit excessive but our options are very limited it appears, at least for now.
